The
biggest mistake people make in purchasing a dildo is buying one that is
too large. While it is true that the body can accommodate many different
sizes, keep in mind that a thinner shaft is easier to to maneuver. If you
have recently had any kind of genital surgery or a long absence from sexual
relations then smaller is better - you can always upgrade. The width of
the dildo may be more important than the length. Dildos vary in diameter
ranging from 1" to 6". As a rule of thumb 1 - 1 1/2" in diameter
will be large enough. The most common dildo lengths are 6, 7, 8 and 9 inches.
The average purchase if for a 6-8" shaft length. If you like very
deep penetration, choose a dildo 8" or longer. You can always thrust less
deeply, but you cannot make a dildo that is too short reach further.
Vaginal length often correlates to height, so if you have a shorter frame
you will probably prefer a shorter dildo.